In a cold winter day, wind blows over the wall of a house at 40 km/h. The outside air temperature is reported to be -7°C. The wall is 8 m long and 5 m height whose surface temperature is 10 °C. (a) Determine the rate of heat loss from the surface of the wall due to the convection; (b) Repeat part (a) for wind velocity varying from 10 km/h to 100 km/h, and plot the rate of heat loss versus the wind velocity; (c) Repeat part (b) for outdoor temperature of 0°C and -10°C, and show the results in a single graph.